Whether you're new to gardening or you'd like a nice reminder system, SproutRobot will build a custom planting schedule based on your zip code so you always know what to plant and when.

Plug in your zip code to SproutRobot and it will generate a sample planting guide for the next few months. If you like what you see you can sign up for their tiered service. The free tier entails automatic emails at the appropriate planting times for your garden crops, you take care of purchasing the seeds. The SproutRobot Plus system ranges from $19.99 to $59.99 per year and entails a hand-checked planting calendar along with a variety of seeds for your planting schedule and climate.